[FFmpeg-trac] #11039(undetermined:new): ffmpeg using wrong default colorspace for HEVC

[FFmpeg]

#11039: ffmpeg using wrong default colorspace for HEVC
-------------------------------------+-------------------------------------
             Reporter:  Jozef        |                     Type:  defect
  Chutka                             |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Using FFmpeg with hevc_videotoolbox and default colorspace will create
 output with a wrong colorspace:

 {{{
 ffmpeg -i premultiplyTest_png_256x256_0MB.png -vcodec hevc_videotoolbox -r
 1 -t 1 -vtag hvc1 -alpha_quality 1 -y out1.mp4
 }}}

 Here is the related issue raised with the chrome team for why rendered
 HEVC colors are washed:

 https://issues.chromium.org/issues/342003180#comment20

 "encode video with an extra -colorspace 13 command, since if you don't
 specify this, ffmpeg will write wrong colorspace matrix info into SPS and
 container."

 I can confirm using adding `-colorspace 13` produces output which renders
 ok in chrome.

 {{{
 ffmpeg -i premultiplyTest_png_256x256_0MB.png -vcodec hevc_videotoolbox -r
 1 -t 1 -vtag hvc1 -alpha_quality 1 -colorspace 13 -y out2.mp4
 }}}

 I wonder if this is something to fixed in ffmpeg?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11039>
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